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East Kutai Regency (, abbreviated as Kutim) is a regency of East Kalimantan province, Indonesia. It has an area of 31,819.79 km2 and had a population of 253,904 at the 2010 census and 434,459 at the 2020 census; the official estimate as at mid 2025 was 464,294 people (comprising 248,235 males and 216,059 females), The town of Sangatta is the capital of the regency.

There are several coal mining companies with concessions around this regency, including Kaltim Prima Coal, one of the largest coal mining companies in Indonesia. The regency also contains one of the largest coal mines in Asia - the East Kutai coal mine.

East Kutai is home to the world's oldest known figurative art at Lubang Jeriji Saléh.

Penduduk Kutai Timur berasal dari beragam suku bangsa, dan salah satu kabupaten yang heterogen di provinsi Kalimantan Timur. Data Sensus Penduduk Indonesia 2010 mencatat bahwa suku bangsa yang dominan di Kutai Timur ialah suku Jawa yakni 70.221 jiwa atau 27,48% dari 255.580 jiwa. Sementara suku asli Kutai Timur yakni Kutai sebanyak 43.307 jiwa atau 16,98%, dan suku Dayak sebanyak 11.160 jiwa atau 4,37%.

Kabupaten Kutai Timur merupakan salah satu wilayah hasil pemekaran dari Kabupaten Kutai yang dibentuk berdasarkan UU No. 47 Tahun 1999, tentang Pemekaran wilayah Provinsi dan Kabupaten. Diresmikan oleh Menteri Dalam Negeri pada tanggal 28 Oktober 1999.

Sangatta, the seat of the regency has a tropical rainforest climate (Af) with moderate rainfall from July to October and heavy rainfall from November to June.